pro diskuzi na abclinuxu.cz

client.cc

#include <iostream>

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

using namespace std;

int get_connected_socket(const char *host, const char *service);


int main(int argc, char *argv[]) {

    int s = get_connected_socket("www.seznam.cz", "80");

    const char *request = "GET / HTTP/1.0\r\nHost: www.seznam.cz\r\n\r\n";

    if (write(s, request, strlen(request)) != strlen(request)) {
        fprintf(stderr, "partial/failed write\n");
        exit(EXIT_FAILURE);
    }

    int size, i;
    char buf[1024];
    std::string response_header, response_body;    
    

  int BUFSIZE = 1;    

    // read HTTP response header
    while ((size = recv(s, buf, BUFSIZE, MSG_WAITALL)))
    {
        cout << "1";
        response_header += buf[BUFSIZE-1];
        i = response_header.find("\r\n\r\n");
        if (i != std::string::npos)
            break;
    }

    cout << "Response header:\n" << response_header << endl;

    // read HTTP response body
    while ((size = recv(s, buf, BUFSIZE, MSG_WAITALL)))
    {
        cout << "2";
        response_body += buf[BUFSIZE-1];
        i = response_body.find("\r\n\r\n");
        if (i != std::string::npos)
            break;
    }
    cout << "Response body:\n" << response_body << endl;

    exit(EXIT_SUCCESS);

}


int get_connected_socket(const char *host, const char *service) {
    // prevzato z man getaddrinfo
    struct addrinfo hints;
    struct addrinfo *result, *rp;
    int sfd, s, j;
    size_t len;
    ssize_t nread;

    /* Obtain address(es) matching host/port */

    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
    hints.ai_socktype = SOCK_STREAM; /* Datagram socket */
    hints.ai_flags = 0;
    hints.ai_protocol = 0;          /* Any protocol */

    s = getaddrinfo(host, service, &hints, &result);
    if (s != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
        exit(EXIT_FAILURE);
    }

    /* getaddrinfo() returns a list of address structures.
        Try each address until we successfully connect(2).
        and) try the next address. */

    for (rp = result; rp != NULL; rp = rp->ai_next) {
        sfd = socket(rp->ai_family, rp->ai_socktype,
                    rp->ai_protocol);
        if (sfd == -1)
            continue;

        if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
            break;                  /* Success */

        close(sfd);
    }

    if (rp == NULL) {               /* No address succeeded */
        fprintf(stderr, "Could not connect\n");
        exit(EXIT_FAILURE);
    }

    freeaddrinfo(result);           /* No longer needed */
    
    return sfd;
}